Understanding Camshaft Fundamentals

A camshaft controls the timing and duration of valve events in an internal combustion engine. It converts rotary motion from the crankshaft into linear motion that opens and closes intake and exhaust valves at precise intervals. The shape of the cam lobes determines how much the valves lift off the seat, how long they stay open, and when they open relative to piston position. These parameters directly affect airflow into and out of the cylinders, which in turn governs horsepower, torque, and engine responsiveness.

Isky Racing Cams, founded by Ed Iskenderian in 1946, has been a leading manufacturer of performance camshafts for over seven decades. The company offers a wide range of camshaft profiles designed for specific applications including street performance, hot rodding, circle track racing, drag racing, off-road, and marine use. Isky cams are engineered using advanced computer modeling and extensive dyno testing to deliver reliable power gains across various engine platforms including Chevrolet, Ford, Mopar, and many others.

Key Camshaft Specifications

When evaluating an Isky camshaft, you will encounter several critical specifications that determine how the cam will perform in your engine:

  • Gross Valve Lift: The maximum distance the valve is lifted off its seat, measured in inches. Higher lift increases airflow but requires valve spring upgrades and clearance checks.
  • Duration at 0.050-Inch Lift: A standardized measurement indicating how long the valve is open, expressed in crankshaft degrees. Longer duration shifts power to higher RPM ranges.
  • Lobe Separation Angle (LSA): The angle between the intake and exhaust lobe centerlines. A tighter LSA (110-112 degrees) builds low-end torque and produces a choppy idle; a wider LSA (114-116 degrees) smooths idle and broadens the powerband.
  • Valve Overlap: The period when both intake and exhaust valves are partially open. Overlap improves cylinder scavenging at high RPM but can hurt idle quality and vacuum for power brakes.
  • Camshaft Lift Type: Flat tappet, roller, or hydraulic roller. Each has different friction, stability, and maintenance requirements.

Power Gains with Isky Camshafts

Installing an Isky camshaft is one of the most effective ways to increase engine output without forced induction. The amount of horsepower and torque gain depends on the specific cam profile, engine displacement, compression ratio, cylinder head flow capability, intake and exhaust system, and supporting modifications. On a typical small-block Chevrolet 350 with moderate compression and a good four-barrel carburetor, swapping a mild street cam for an Isky 270 Mega-Cam can yield a 20-30 horsepower increase at the rear wheels with notable mid-range torque gains.

Power Gains by Application

Below are realistic power gain estimates based on engine type and cam selection:

  • Street / Daily Driver: Gains of 15-25 horsepower with improved throttle response. Choose cams with duration around 260-270 degrees at 0.050” lift and LSA of 112-114 degrees. Example: Isky 262 Mega-Cam.
  • Performance Street / Mild Hot Rod: Gains of 30-45 horsepower with a noticeable powerband shift from 2,500-6,000 RPM. Choose duration 270-280 degrees and LSA 110-112 degrees. Example: Isky 270 Mega-Cam.
  • Drag Race / Circle Track: Gains of 50-80 horsepower at high RPM. Choose duration 290-310 degrees and LSA 106-110 degrees. Example: Isky 292 Super Cam.
  • Marine / Off-Road: Gains of 20-35 horsepower with emphasis on low-end torque and reliability. Choose cams with wider LSA and reduced overlap.

The Isky camshaft selector tool can help match a specific profile to your engine combination. Keep in mind that peak horsepower numbers from a cam swap depend heavily on supporting components. A cam that adds 40 horsepower with headers and an aluminum intake may only add 15 horsepower on a stock-engine. Always consider exhaust, intake, carburetion or fuel injection, ignition timing, and computer tuning when estimating gains.

Dyno-Confirmed Results

In a documented dyno test published on the Isky website, a mildly built 350 Chevy with 9.5:1 compression, a dual-plane intake, 600 CFM carburetor, and long-tube headers showed a gain of 34 horsepower and 28 foot-pounds of torque when swapping from a stock conservative cam to an Isky 270 Mega-Cam. Peak power moved from 4,800 RPM to 5,400 RPM, and torque was up throughout the entire curve from 3,000 to 6,300 RPM.

Choosing the Right Isky Camshaft for Your Engine

Selecting the correct cam requires matching the profile to your engine’s displacement, intended RPM range, compression ratio, cylinder head capability, and usage type. Isky divides its offerings into several series to simplify the process:

Mega-Cam Series

The most popular street performance line. These cams are designed for engines with compression ratios between 8.5:1 and 10.5:1. They provide a broad powerband, good idle quality, and compatibility with stock torque converters and modest rear gears (3.08-3.55:1). Available in flat tappet and hydraulic roller configurations.

Super Cam Series

Aggressive profiles for serious street-strip and circle track builds. These cams require higher compression (10.0:1 or more), aftermarket cylinder heads, a high-stall torque converter (2,800-3,500 RPM stall), and lower rear gears (3.73-4.56:1). Idle is rough but acceptable for dual-purpose cars.

Torque Master Series

Optimized for low-RPM torque in trucks, towing, marine, and off-road applications. These cams have shorter duration and wider LSA to build strong cylinder pressure from idle to 4,500 RPM. They work well with stock converters and stock gears.

Roller Cams

Isky offers hydraulic and mechanical roller cams for engines equipped with roller lifters. Roller profiles have reduced friction, more aggressive lobe shapes, and can achieve higher lift without excessive duration. They are popular with modern LS-based engines and retro-roller retrofits on small-block Fords and Chevys.

For a comprehensive list of all Isky camshaft series, visit Isky Racing Cams.

Installation Tips for Isky Camshafts

Proper installation is critical to achieving the advertised power gains and ensuring long cam life. Below are detailed steps and tips for installing an Isky camshaft in a typical pushrod V8 engine.

Preparation and Tools

  • Tools needed: Degree wheel, dial indicator with magnetic base, harmonic balancer puller, camshaft installation tool (or a long bolt and washer), torque wrench, valve spring compressor, feeler gauges, and a timing chain set.
  • Parts needed: New Isky camshaft, matching lifters (flat tappet or roller), gaskets (timing cover, intake manifold, valve covers), timing chain and gears, assembly lube, and valve springs rated for the cam’s lift.
  • Check cam specifications: Measure the cam’s base circle, lobe lift, and duration using a degree wheel and dial indicator. Confirm the cam is ground correctly before installation.

Step-by-Step Installation

  1. Set engine to Top Dead Center (TDC): Rotate the crankshaft until the number one piston is at TDC on the compression stroke. Verify by feeling compression at the spark plug hole and aligning the harmonic balancer timing mark to 0 degrees.
  2. Remove the old cam and components: Drain coolant, remove radiator, water pump, harmonic balancer, timing cover, timing chain and gears, intake manifold, valve covers, rocker arms, pushrods, and lifters. Label parts for reassembly.
  3. Remove the cam retainer plate: Unbolt the camshaft retainer plate (if equipped) or thrust button. Carefully slide the old cam out through the front of the engine. Inspect cam bearings for wear.
  4. Lubricate and install the new cam: Apply assembly lube generously to all camshaft bearings and lobes. Insert the camshaft slowly, rotating it to align with the bearings. If resistance is felt, do not force it; inspect for burrs or misalignment.
  5. Install timing chain and gears: Align the cam and crank timing marks according to the manufacturer’s instructions. Double-check that the cam bolt is torqued to specification. Rotate the engine two full revolutions and verify the timing marks realign.
  6. Degree the camshaft: Using a degree wheel on the crankshaft and a dial indicator on a pushrod or lifter, check the intake opening and closing points. Adjust cam timing using offset keys or a multi-index timing set if your engine requires a specific intake centerline.
  7. Check valve-to-piston clearance: With the cylinder heads installed, place clay on the piston dome, rotate the engine through two cycles, and measure the compressed clay thickness. Minimum clearance: 0.080 inches for intake, 0.100 inches for exhaust. If clearance is insufficient, you may need flycut pistons or a different cam.
  8. Check valve spring clearance: Verify that valve springs are not coil-binding at maximum lift. The installed height and spring pressure should support the cam’s lift. Isky recommends a minimum seat pressure of 110-130 pounds for flat tappet cams; more for roller cams.
  9. Install lifters: Dip each lifter in assembly lube. For flat tappet cams, do not swap lifters side to side; break-in requires them to stay paired with their initial lobe. Torque lifter retaining hardware to spec.
  10. Reassemble and prime oil system: Install pushrods, rocker arms, intake manifold, timing cover, and all other components. Use a priming tool on the oil pump to pressurize the system before starting. Rotate the cam and lifters by hand several times to distribute oil.

Common Mistakes to Avoid

  • Improper break-in procedure: Flat tappet cams require a specific break-in process—run the engine at 2,000-2,500 RPM for 20 minutes with no idling, using break-in oil with high zinc content. Roller cams do not require this break-in but still need proper lubrication.
  • Not checking pushrod length: Changing cam base circle may require longer or shorter pushrods to restore proper rocker arm geometry. Always measure pushrod length with an adjustable pushrod.
  • Forgetting to replace timing chain and gears: An old chain with slack will alter cam timing and reduce performance. Always use a new double-roller timing set when installing a new cam.
  • Neglecting valve spring upgrade: Stock valve springs will coil-bind or suffer from valve float at high RPM with a performance cam. Always install new springs rated for the cam’s lift and RPM range.

Cost Analysis of Isky Camshafts

The total investment for an Isky camshaft upgrade goes beyond the cam itself. Below is a detailed breakdown of expected costs for a typical small-block Chevrolet or Ford performance application. Prices are estimated and may vary by retailer and location.

Component Costs

Item Estimated Cost
Isky Camshaft (flat tappet hydraulic) $250 - $400
Isky Hydraulic Roller Cam $450 - $750
Lifters (flat tappet set) $80 - $150
Valve Springs (set of 16) $100 - $200
Timing Chain and Gears (double roller) $60 - $120
Gaskets and Seals $40 - $80
Assembly Lube and Break-In Oil $30 - $50

Parts total: $560 to $1,100 for a flat tappet upgrade; $760 to $1,350 for a hydraulic roller upgrade.

Labor Costs

Professional installation adds significant cost. Shop rates range from $100 to $175 per hour. A cam swap typically takes 8-12 hours depending on engine complexity and whether cylinder heads need to be removed for valve spring replacement. Expect:

  • Cam only installation (if cylinder heads stay on): $800 - $1,200
  • Full cam swap including cylinder head removal and valve job: $1,500 - $2,500

Additional Modification Costs

To fully realize the power gains from an Isky cam, you may need to upgrade other components:

  • Carburetor or EFI tuning: $100 - $400 for a professional dyno tune.
  • High-stall torque converter (automatic transmission): $400 - $800.
  • Aftermarket cylinder heads: $800 - $2,500 per pair if the stock heads are restrictive.
  • Exhaust headers: $300 - $800.

When budgeting, factor in compression ratio and dynamic compression—a cam swap may require different octane fuel or additional engine work to avoid detonation.

Maintenance and Longevity Considerations

An Isky camshaft, when installed correctly and broken in properly, can last the life of the engine. Flat tappet cams are more sensitive to oil chemistry and require zinc dialkyldithiophosphate (ZDDP) levels of at least 1,200 ppm for break-in and 800 ppm for ongoing use. Use oils specifically formulated for flat tappet engines or add a ZDDP supplement. Roller cams are less susceptible to lobe wear but still require clean oil and regular changes.

We recommend reviewing Isky’s tech support page for current recommendations on oil, springs, and installation procedures. They also provide custom grind services for engines with unusual requirements.

Final Thoughts on Your Isky Camshaft Selection

Choosing an Isky camshaft is an investment that can dramatically improve your engine’s character and performance. By matching the cam profile to your engine’s specifications and your driving goals, you can achieve a powerband that suits everything from daily commuting to weekend racing. Remember to factor in installation labor, supporting upgrades, and proper break-in procedures to get the most from your cam. With decades of engineering heritage and a vast product lineup, Isky Racing Cams remains a trusted choice for enthusiasts who demand real, measurable power gains.